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EWG's Tap Water Database — 2019 UPDATE

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1,4-Dioxane

Tract 349 Mutual Water Co.

1,4-Dioxane is a solvent classified by the EPA as a likely human carcinogen. It contaminates groundwater in many states due to industrial wastewater discharges, plastic manufacturing runoff and landfill runoff. Read More.

Animal studies show that 1,4-dioxane can target the liver, kidneys and respiratory system, and that prenatal exposure can harm the developing fetus. The State of California has set a Public Heatlh Goal of no more than 1 part per billion of 1,4-dioxane in drinking water. The state of Massachusetts sets a legal limit of 0.3 ppb, and New Hampshire's limit is 3 parts per billion. There is no national drinking water standard for this contaminant.

Click here to read more about 1,4-dioxane.

 

58

Samples

0

Samples exceeding legal limit (MCL)

51

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20122.32 ppb551.10 ppb - 3.30 ppb
20131.44 ppb85ND - 3.40 ppb
20143.80 ppb881.20 ppb - 5.60 ppb
20152.79 ppb86ND - 5.30 ppb
20162.17 ppb1312ND - 5.30 ppb
20172.22 ppb1615ND - 5.20 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.35 ppb

The EWG Health Guideline of 0.35 ppb for 1,4-dioxane was defined by the Environmental Protection Agency as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

ppb = parts per billion

All test results

Date Lab ID Result
2012-04-242706-003-08402.60 ppb
2012-07-122706-003-08103.30 ppb
2012-08-092706-002-09051.30 ppb
2012-10-222706-002-10401.10 ppb
2012-10-222706-003-10553.30 ppb
2013-01-212706-003-11253.40 ppb
2013-01-212706-002-1140ND
2013-04-162706-002-08201.000 ppb
2013-04-232706-003-11452.70 ppb
2013-07-112706-003-08202.20 ppb
2013-10-102706-002-0914ND
2013-10-242706-003-09302.20 ppb
2013-10-242706-002-0900ND
2014-01-279588-003-10354.20 ppb
2014-02-069588-002-09163.80 ppb
2014-04-169588-002-10152.10 ppb
2014-04-239588-003-09255.30 ppb
2014-07-289588-003-09355.40 ppb
2014-07-319588-002-09151.20 ppb
2014-12-099588-003-09145.60 ppb
2014-12-129588-002-09382.80 ppb
2015-03-209588-003-09184.80 ppb
2015-03-209588-002-09301.40 ppb
2015-04-249588-003-09254.10 ppb
2015-04-249588-002-0940ND
2015-07-309588-002-11331.60 ppb
2015-07-309588-003-11505.10 ppb
2015-10-239588-002-0932ND
2015-10-269588-003-09295.30 ppb
2016-01-299588-003-09003.60 ppb
2016-03-299588-002-09261.000 ppb
2016-05-139588-003-09255.20 ppb
2016-05-279588-002-09151.000 ppb
2016-06-249588-002-09011.10 ppb
2016-07-229588-002-09391.10 ppb
2016-08-129588-003-09225.20 ppb
2016-08-269588-002-09201.30 ppb
2016-09-169588-002-09161.10 ppb
2016-10-149588-002-0930ND
2016-11-049588-002-10001.30 ppb
2016-11-189588-003-09315.30 ppb
2016-12-099588-002-09351.000 ppb
2017-01-279588-002-0920ND
2017-02-109588-002-08501.50 ppb
2017-02-249588-003-09104.90 ppb
2017-03-109588-002-09251.10 ppb
2017-04-219588-002-09071.10 ppb
2017-05-059588-003-09054.80 ppb
2017-05-199588-002-08551.000 ppb
2017-06-239588-002-09303.30 ppb
2017-07-149588-002-09151.20 ppb
2017-08-189588-002-09301.30 ppb
2017-08-309588-003-09255.20 ppb
2017-09-229588-002-09251.20 ppb
2017-10-139588-003-09125.00 ppb
2017-10-279588-002-09501.30 ppb
2017-11-179588-002-11151.30 ppb
2017-12-089588-002-09011.30 ppb